How is the air consumption of pneumatic valves calculated?
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What factors should be considered when calculating the air consumption of pneumatic valves? Should the air consumption of electrical valve positioners and valves, or cylinders and valves, be taken into account, or should only the air consumption of the valve positioners be calculated?
It is generally an estimate: cylinder valves are calculated at 1 m3/h, while control valves are calculated at 0.5 m3/h.
The unit value mentioned above omits N. Roughly speaking, control valves should have a flow rate of 1–2 Nm3/h; for specific details, refer to the HGT20510-2000 regulations on instrument air supply design or the SH3020-2001 standards for instrument air supply design in the petrochemical industry
The design specifications issued by the Ministry of Chemical Industry do provide a value of 1–2 Nm3/h; however, the valve positioner manufacturers suggest 0.3 Nm3/h, and it should be fine to use 0.5 Nm3/h for control valves.
I mean, for those switch valves with large diaphragms these days, the gas consumption is related to how often you use them